"Heaps' law" meaning in English

{
  "etymology_text": "Named after Harold Stanley Heaps, but was originally discovered by Gustav Herdan.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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        {
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Computational linguistics",
          "orig": "en:Computational linguistics",
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            "Computer science",
            "Linguistics",
            "Computing",
            "Sciences",
            "Language",
            "Social sciences",
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            "Communication",
            "Society",
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          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
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            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An empirical law that expresses the correlation between the length of a document or set of documents and the corresponding number of distinct words."
      ],
      "id": "en-Heaps'_law-en-noun-iEAu0aL3",
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          "correlation"
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          "length"
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        [
          "document",
          "document"
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        [
          "word",
          "word"
        ]
      ],
      "raw_glosses": [
        "(linguistics) An empirical law that expresses the correlation between the length of a document or set of documents and the corresponding number of distinct words."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
        "Heaps' law"
      ]
    }
  ],
  "word": "Heaps' law"
}

{
  "etymology_text": "Named after Harold Stanley Heaps, but was originally discovered by Gustav Herdan.",
  "head_templates": [
    {
      "args": {
        "head": "Heaps' law"
      },
      "expansion": "Heaps' law",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Computational linguistics",
        "en:Linguistics"
      ],
      "glosses": [
        "An empirical law that expresses the correlation between the length of a document or set of documents and the corresponding number of distinct words."
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
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        ],
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          "length",
          "length"
        ],
        [
          "document",
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        ],
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        ]
      ],
      "raw_glosses": [
        "(linguistics) An empirical law that expresses the correlation between the length of a document or set of documents and the corresponding number of distinct words."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
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    }
  ],
  "word": "Heaps' law"
}